LINUX_MIB_TCPSYNCHALLENGE  255 net/ipv4/proc.c 	SNMP_MIB_ITEM("TCPSYNChallenge", LINUX_MIB_TCPSYNCHALLENGE),
LINUX_MIB_TCPSYNCHALLENGE 5515 net/ipv4/tcp_input.c 		NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPSYNCHALLENGE);